Roxy

So basically you'd like to switch the two domains out. trackbunnies.org (which is your MAIN domain) you want it to become a subdomain of your wanted MAIN domain, which will be trackbunnyfilms.com? Correct?

If so, then you will not have to purchase a new package, all you'll have to do is submit a ticket to the held desk asking for them to switch your root domain. Once you've done this, make a backup of your root files and place them in a folder/directory to create the sud-domain.